Black Hole River Hunter

Black Hole River Hunter
The quest to understand our solar system begins close to home.

Source:

Event Horizon Telescope Collaboration

The supermassive black hole imaged by the EHT is located in the center of the elliptical galaxy M87, located about 55 million light years from Earth. This image was captured by FORS2 on ESO's Very Large Telescope. The short linear feature near the center of the image is a jet produced by the black hole. Credit: ESO

This artist's impression depicts a rapidly spinning supermassive black hole surrounded by an accretion disc. The black hole is labeled, showing the anatomy of this fascinating object. Credit: ESO

This celestial circle of light is produced by the glow of sunlight scattered through the periphery of Titan's atmosphere as the Sun is occulted by Titan. It is the sum of all the sunsets and sunris...

This is a highly detailed look at the feathery, wavelike patterns in the cloud bands of Saturn's southern hemisphere. Near the center, long filaments wrap around a swirling vortex. Notable is the e...

This image is one of seven from the narrow-angle camera on NASA's Cassini spacecraft assembled as a brief movie of high-altitude cloud movements on Jupiter. It was taken in early October 2000.

This image shows InSight's domed Wind and Thermal Shield, which covers its seismometer.

Shadows cast onto Saturn by its rings, visible here as dark bands, move steadily towards the equator and grow thinner as equinox approaches.

The Sun will cross Saturn's ring plane on Aug. 10, 20...

These two Cassini images, taken four years before Saturn's August 2009 equinox, have taken on a new significance as data gathered at equinox indicate the streaks in these images are likely evidence...

Surface Streaks
October 28, 2004

Full-Res: PIA06991

This medium-resolution view shows some of the surface streaks of Titan's equatorial t...

Catching Saturn's Waves
September 17, 2004

Full-Res: PIA06479

The Cassini spacecraft captured this artistic view of elegant waves and...

Hovering Mimas
September 16, 2004

Full-Res: PIA06478

Saturn's moon Mimas hangs in the sky above Saturn's rings in this Cassini spa...

These images from NASA's Dawn spacecraft are located in asteroid Vesta's Urbinia quadrangle, in Vesta's southern hemisphere. Rays of bright material surround Canuleia crater and rays of dark materi...

Following a successful close flyby of Enceladus, NASA's Cassini spacecraft captured this artful composition of the icy moon with Saturn's rings beyond.

Like an ancient mariner charting the coastline of an unexplored wilderness, Cassini's repeated encounters with Titan are turning a mysterious world into a more familiar place.

During a Titan flyby...

Capturing the interplay between light and shadow, the Cassini spacecraft looks toward the night side of Saturn where sunlight reflected off the rings has dimly illuminated what would otherwise be t...

This composite was produced from images returned yesterday, January 14, 2005, by the European Space Agency's Huygens probe during its successful descent to land on Titan. It shows the boundary betw...

The Cassini spacescraft takes a break from the Saturn system to check out the Seven Sisters.

Cassini imaged the Pleiades star cluster, also called the Seven Sisters, as part of a routine to moni...

Click here for the QuickTime video.

Mimas, a little moon of Saturn with a big crater, is the star of this movie. This movie consists of 37 individual frames taken over 20 minutes, while Cassini r...

These three images, created from Cassini Synthetic Aperture Radar (SAR) data, show the appearance and evolution of a mysterious feature in Ligeia Mare, one of the largest hydrocarbon seas on Saturn...

In this extremely narrow angle field-of-view artist's rendering Iapetus, with its notable dark surface, occupies the foreground
with a dimly lit crescent Saturn low in the sky. Iapetus' surface sh...

This image of bright spots in a small crater on Ceres was obtained by NASA's Dawn spacecraft on July 1, 2018 from an altitude of about 179 miles (288 kilometers).

During a non-targeted flyby by the Cassini spacecraft of Saturn's moon Enceladus on Nov. 26, 2005, Cassini's visual and infrared mapping spectrometer measured the spectrum of the plumes originating...

Saturn's brilliant limb shines through the semi-transparent A ring, while the outer F ring shepherd moon hangs against the black sky.

F-ring shepherding moon Pandora (81 kilometers, or 50 miles ac...

This highly oblique image shot over northwestern part of the African continent captures the curvature of the Earth and shows its atmosphere. You can see clouds and even the occasional thunderhead. ...

The orbits of Dione and Titan bring them together in one frame in this distant glimpse from the Cassini spacecraft.

Light and dark areas on Dione (1123 kilometers, or 698 miles across), at the top...

This sweeping view of Saturn's rings offers a look at how the planet's moons help shape and maintain this structure, making Saturn the jewel of the solar system.

Some of the bright lanes seen here...

The extreme contrast in this view of the unlit side of Saturn's rings is intentional. Contrast-enhanced views like this are used to look for spokes (the transient, ghostly lanes of dust seen in NAS...

A new image shows at least 17 dust rings created by a rare type of star and its companion locked in a celestial dance.

The new research supports the longstanding idea that water could potentially erupt above the surface of Europa.

Analysis of data obtained by NASA’s DART team shows the spacecraft's impact successfully altered the orbit of Dimorphos.

InSight’s team is taking steps to help the solar-powered lander continue operating for as long as possible.

Science enthusiasts have processed the new JunoCam images of Jupiter’s icy moon, with results that are out of this world.

The spacecraft’s pass of the moon provided the first close-up in over two decades of this ocean world.

Mercury

Venus

Earth

Mars

Jupiter

Saturn

Uranus

Neptune

Pluto

Ceres

Makemake

Haumea

Eris

This site is maintained by the Planetary Science Communications team at
NASA’s Jet Propulsion Laboratory for
NASA’s Science Mission Directorate .

This is the first picture of a black hole.
Using the Event Horizon Telescope, scientists obtained an image of the black hole at the center of the galaxy M87. (There is a supermassive black hole at the center of our galaxy — the Milky Way .)
The black hole is outlined by emission from hot gas swirling around it under the influence of strong gravity near its event horizon.
A black hole is a dense, compact object whose gravitational pull is so strong that – within a certain distance of it – nothing can escape, not even light.
Black holes are thought to result from the collapse of very massive stars at the ends of their evolution. The gravity is so strong because matter (the mass) has been squeezed into a tiny space.

Director, NASA Planetary Science Division:
Dr. Lori Glaze

NASA Official:
Kristen Erickson

Science Writer & Site Manager:
Amanda Barnett

Social Media Lead:
Bill Dunford

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Frost Black Hills Steel Whiskey River Hunter

Frost Black Hills Steel Whiskey River Hunter
A CALIFORNIA LAW, PROPOSITION 65 WARNING: This product contains [one or more] chemicals, including lead, known to the State of California to cause [cancer and] birth defects or other reproductive harm.
The Frost Black Hills Steel Whiskey River Hunter features mirror polished stainless steel blade with thumb ridges. It has a full tang, Whiskey River composition handles, double steel rivets, a lanyard hole, and a nylon belt sheath. It has a 3.37" clip point blade that is It is made in China.
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This article is more than 7 years old
This article is more than 7 years old
River hunter Adriano Sampaio at a water source in Homero Silva park in São Paulo’s Pompéia neighbourhood. Photograph: Christian Tragni
São Paulo – anatomy of a failing megacity: residents struggle as water taps run dry
Original reporting and incisive analysis, direct from the Guardian every morning
© 2022 Guardian News & Media Limited or its affiliated companies. All rights reserved. (modern)
Many paulistanos are facing dry taps, yet there is plenty of water to go around in São Paulo. In the second part of our series on the struggling megacity, we meet the urban explorer who knows all of its hidden rivers and springs
News of São Paulo’s water crisis has, by now, spread far and wide. But although the word “seca” (drought) is much in use, and though a severe lack of rain is one of the many factors in play, when it comes to actual shortage of water, the truth – as with almost everything else in this sprawling metropolis – is that it’s complicated.
There’s a wealth of water in São Paulo: it’s just not always in the right places. As if to drive the point home, the late-afternoon rain that drenches the city most days in summer has been rare this year; yet during one recent, torrential storm, half the rain expected for the entire month of February fell in the space of just a few hours.
When the storm hit downtown São Paulo, the bus terminal at Praça Pedro Lessa, in the Valley of Anhangabaú, was quickly awash, shin-deep in water in a matter of minutes. Gushing down the hill towards it along Rua Capitão Salomão, a fast-moving current of water sent a fleet of black rubbish bags sailing down the street, straight into the back of the suddenly motionless traffic.
For some of those looking glumly from the windows of stationary buses, flooded streets awaited at home; or worse still, soaked sofas, ruined fridges, and kitchen floors slick with mud. In this chronically built-up subtropical city, high-velocity runoff from the essentially impermeable surface drives storm canals to dangerous, fast-moving levels, and causes flash flooding and even landslides in some neighbourhoods, even as millions grapple with the daily problem of limited or non-existent water supplies.
Water, unsurprisingly, is a topic of ceaseless discussion, and the source of considerable collective anxiety. And for some, including a handful of well-informed amateur water-watchers, it has become a life-altering obsession.
In adventures he chronicles on his Facebook page, Existe Água em SP (“There is Water in SP”), the river hunter Adriano Sampaio is a tireless urban expeditionist, walking the city in search of lost rivers and springs, and posting a steady stream of videos to his page. He and his friend Ramon Bonzi, an urbanist, use 1930s maps laid over modern-day street maps to track down hidden and forgotten waterways, peering over walls, lifting manhole covers and climbing about in the undergrowth in search of rivers, streams and springs. “We always find something,” says Sampaio.
Wearing his trademark Panama hat, he ranges from the city’s affluent centre-west to its immense eastern expanses – in a recent post filmed in the working-class neighbourhood of Cidade Antonio Estevão de Carvalho, he shows residents fishing in a community-created lake, and reports on overgrown, neglected streams and on raw sewage infiltrating the waterways, “straight from the public sewerage system”.
On one expedition to Pirituba in the north of the city, Sampaio drank from a spring the community uses for drinking water, and became so ill that he ended up in hospital. “It’s vital that the different springs and water sources around the city are tested and labelled,” he says, “so that people know what use each source can safely be put to.”
A self-confessed passionate amateur, Sampaio’s work follows in the expert footsteps of the project Rios e Ruas (Rivers and Roads), created by geographer and water systems specialist Luiz de Campos and José Bueno, an architect. They have been mapping the city’s waterways since 2010, and also organise expeditions and weekend taskforces, bringing teams of volunteers together to clean up neglected rivers and streams.
São Paulo has nearly 300 named waterways, says de Campos, and probably closer to 500 in total. A collective map used by Rios e Ruas shows the city looking like a vital organ, encased in a blue web of waterways – a network of mostly buried rivers and streams totalling more than 3,000 km. “There’s plenty of water in São Paulo,” says de Campos. “It’s just very badly managed.”
Sampaio, a lifelong nature-lover, was first inspired to action in 2013, after a chance discovery he made while walking in a small park, Praça Homero Silva, close to where he grew up in the neighbourhood of Pompéia. “I noticed that the ground was muddy, and I started digging,” he recalls.
Within minutes, water began seeping from the earth. Sampaio dug another hole, and another, and as water sprang from the ground, he was hooked. Setting to work to channel the water from the various springs he uncovered in the park, he quietly created a small pond, without permission, at the bottom of the park; and in July 2014, with the help of friends and supporters, a second pond, right beside the first. “We only used materials we found in the area,” he says.
The ponds took several months to fill up, but today, they are brimming with plant life in and around the water, and teeming with fish – around 10 species introduced by Sampaio, including fat tilapia and carp, peixe cascudo , peixe vidro , paulistinha , espadinha and tiny guarú ( the latter excellent for eating mosquitos and their larvae, and thus combating the spread of dengue fever, which is on the rise in the city as a result of millions of litres of hoarded water). The ponds attract all manner of birds, and they also attract people: “People were a little wary of coming through the park before,” says Sampaio.
The park’s abundance of water comes as no surprise to its neighbours, many of whom have had springs in their back yards for generations. In a simple house whose back wall borders the park, metres from the fishponds, Eli Maria Jose Salis and her family have enjoyed a steady supply of spring water, run in from the park in a pipe that leads to a second water tank, for more than 30 years.
Do they need it to top up the water supply they get from SABESP (the city’s privatised water board)? “No, we get plenty of water,” says Salis. “It’s not that. It’s just that we have all this water, and it wouldn’t be right to waste it.” SABESP, meanwhile, loses more than 30% of the treated drinking water in its distribution network as a result of massive leakage from badly deteriorated pipes, as well as theft and clandestine connections.
SABESP, like Existe Água em SP and Rios e Ruas, is also on the hunt for rivers. In a series of urgent “mega-projects” aimed at making up the shortfall in São Paulo’s water supply, it is working on a project to reverse the course of the River São Lourenço, and to siphon millions of gallons of water from the Rivers Paraíba do Sul, Guaió, Juquiá and Itatinga, piping the water to the city of São Paulo’s Alto Tietê and Cantareira reservoir systems. State governor Geraldo Alckmin is hoping the measures will banish the spectre of a draconian two-day-on/five-day-off water rationing regime that is still on the cards, if reservoirs have not recovered sufficiently by the start of the dry season in April.
“The authorities only seem able to conceive of massive construction works, costing billions,” says Sampaio. “But they’re not even guaranteed to work – many of those rivers are extremely low on water too.”
Sampaio gave up his job as an insurance salesman last year, after 20 years, to devote himself to environmental activism full-time. As we stand on a piece of wasteland above the park, taking in the view across Pompéia, he expounds on the urgent need for reforestation, and on the subject of “linear parks” alongside rivers and streams, which create lakes, ponds and bodies of water capable of retaining stormwater and rainwater, as well as places for people to sit, walk and cycle in peace.
“I want to help remind peo
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